Liquid chromatography sample measuring and introducing apparatus
ApplicationNo. 235007 filed on 04/28/1994
US Classes:417/410.4, Interengaging rotary pumping members210/101, Proportionate feed means210/198.2, Chromatography417/420, Pump magnetically coupled to rotary drive418/188Supply or exhaust passage through working member center of rotation
ExaminersPrimary: Therkorn, Ernest G.
International ClassesB01D 015/08
AbstractA gear pump is used for the primary flow source for a low pressure, high performance separation system. The pump is controlled such that its flow and leakage characteristics are compensated by an electronic controller which results in controlled output flow rates to a variety of loads. The pump is particularly suited for use in liquid chromatography (LC) systems, especially LC systems which use membrane based separation media. A modification to the gear pump results in an efficient mixer, further enhancing its use in LC systems which involve gradient operational modes. Also disclosed are embodiments which allow the gear pump to be used in high pressure separation systems, e.g., high performance liquid chromatography (HPLC) systems.
Field of SearchLiquid/liquid or gel type (i.e., jellylike) chromatography
Including liquid flow diversion
Proportionate feed means
With pump, gas pressure or vacuum source
With pump, gas pressure, or suction source
Rotary expansible chamber pump
Interengaging rotary pumping members
Pump magnetically coupled to rotary drive
Supply or exhaust passage through working member center of rotation